docs(installing_deis): add private network address requirement

Author: carmstrong

docs/_includes/_private-network.rst

@@ -0,0 +1,3 @@
+Due to changes introduced in Docker 1.3.1 related to insecure Docker registries, the hosts running
+Deis must be able to communicate via a private network in one of the RFC1918 private address spaces:
+``10.0.0.0/8``, ``172.16.0.0/12``, or ``192.168.0.0/16``.

docs/installing_deis/baremetal.rst

@@ -60,6 +60,8 @@ Update $private_ipv4
 the user-data with the (private) IP address of the node.
 
 
+.. include:: ../_includes/_private-network.rst
+
 Add Environment
 ^^^^^^^^^^^^^^^
 

docs/installing_deis/system-requirements.rst

@@ -44,6 +44,11 @@ If running multiple (at least three) machines of an adequate size is unreasonabl
 investigate the `Dokku`_ project instead. Dokku is `sponsored`_ by Deis and is ideal for environments
 where a highly-available distributed system is not necessary (i.e. local development, testing, etc.).
 
+Network
+-------
+
+.. include:: ../_includes/_private-network.rst
+
 .. _`dokku`: https://github.com/progrium/dokku
 .. _`optimal etcd cluster size`: https://github.com/coreos/etcd/blob/master/Documentation/optimal-cluster-size.md
 .. _`sponsored`: http://deis.io/deis-sponsors-dokku/